Method and apparatus for estimating line inductance for PWM rectifier control

a technology of estimating line inductance and rectifier, which is applied in the direction of control system, conversion with intermediate conversion to dc, emergency protective circuit arrangement, etc., can solve the problem that the diode rectifier typically encounters difficulty in attempting to meet harmonic distortion constraints, is more expensive than the conventional diode rectifier, and is typically precluded from using pwm rectifiers in medium performance applications

Active Publication Date: 2008-02-26
ROCKWELL AUTOMATION TECH
View PDF6 Cites 38 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Diode rectifiers typically encounter difficulty in attempting to met the harmonic distortion constraints.
Typical PWM rectifiers are better able to meet the harmonic distortion requirements, but are more costly than conventional diode rectifiers.
This cost differential has typically precluded the use of PWM rectifiers in medium performance applications.
Previous techniques typically require additional hardware or increased complexity, and sometimes involve injecting test signals or switching in loads, to estimate line impedance.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and apparatus for estimating line inductance for PWM rectifier control
  • Method and apparatus for estimating line inductance for PWM rectifier control
  • Method and apparatus for estimating line inductance for PWM rectifier control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022]One or more specific embodiments of the present invention will be described below. It is specifically intended that the present invention not be limited to the embodiments and illustrations contained herein, but include modified forms of those embodiments including portions of the embodiments and combinations of elements of different embodiments as come within the scope of the following claims. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A rectifier includes a switching circuit and a controller. The switching circuit is coupled between positive and negative buses and a plurality of input voltage sources. The switching circuit includes a plurality of pairs of switching devices. Each pair is associated with one of the input voltage sources. The controller includes first and second control loops operable to generate control signals for operating the pairs of switching devices to generate a potential across the positive and negative buses. The controller is further operable to estimate a line inductance seen by the rectifier based on at least one of the control signals and generate an inductance compensation gain factor for applying to the control loops based on the estimated line inductance.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]Not applicable.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0002]Not applicableBACKGROUND OF THE INVENTION[0003]The present invention relates generally to power conversion and conditioning and, more particularly, to estimating line inductance for controlling a pulse width modulation (PWM) rectifier.[0004]This section of this document is intended to introduce various aspects of art that may be related to various aspects of the present invention described and / or claimed below. This section provides background information to facilitate a better understanding of the various aspects of the present invention. It should be understood that the statements in this section of this document are to be read in this light, and not as admissions of prior art.[0005]Power plants are linked to power consuming facilities (e.g., buildings, factories, etc.) via utility grids designed so as to be extremely efficient in delivering massive amou...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(United States)
IPC IPC(8): H02M5/40H02H7/125H02M5/458
CPCH02P21/145H02P21/16
Inventor TALLAM, RANGARAJAN M.
Owner ROCKWELL AUTOMATION TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap